Helium and other noble gases in gas-hydrate sediments of the Håkon Mosby Mud Volcano |
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| Authors: | E M Prasolov I V Tokarev G D Ginsburg V A Soloviev G M Eltsova |
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| Institution: | (1) VNIIOkeangeologia Angliyskiy pr., 1, 190121, St. Petersburg, Russia, RU;(2) St. Petersburg State University (SPbGU), Department of Hydrogeology. Universitetskaia nab., 7/9, 199034, St. Petersburg, Russia, RU;(3) Institute of Precambrian Geology and Geochronology of Russian Academy of Science (IGGD RAN). Nab. Makarova, 2, 199034, St. Petersburg, Russia, RU |
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| Abstract: | He, Ar, Ne contents and 3He/4He, 4He/20Ne, and 40Ar/36Ar ratios in gas-hydrate bearing sea-floor sediments of the Håkon Mosby Mud Volcano show that Ne, Ar, and part of He are atmospheric. Nonatmospheric, deep He (3He/4He=0.9???10-8) is present in all samples. Helium isotopic composition suggests that its origin is uniform, crustal (radiogenic) and, probably, connected with mud volcano gases. Apparently deep helium is residual gas that remains in isolated volumes after hydrate formation. Measured helium content in hydrate gases is very low: 0.5–10?ppm. but in one particular sample it is very high: 7080?ppm. |
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